Concept Checkpoints is a series of easy-to-answer questions designed to call attention to various aspects of theory.

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CHECKPOINT QUESTIONS
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The suspended weight on the pulley creates a moment that acts around the shaft axis. A shear force V, developed in the shear key, keeps the pulley attached to the shaft. This force develops shear stress in the key at the radial distance where the pulley and shaft touch.

Divide this force V by the shear key area subjected to stress. (Note: Visualize the surface that would be exposed if V was large enough to break the shear key.)

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Consider one of the plastic strips, for instance, strip (1). Shear stresses in the glue must transmit a force of P = 80.00 kN from strip (1) to the splice plates. The total glue area required for strip (1) is:
There are two glue surfaces on (1), each having a width of 300 mm and a length of L/2. Express this relationship in an equation and solve for L:
Therefore:
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